When performing engine compartment checks and maintenance, when should the work be performed?

• A. While the engine is running
• B. Only when the engine is shut off
• C. Before fueling
• D. During operation

Answer: (B)

Work should be done only when the engine is shut off. When the engine is running, moving parts like the fan and belts can grab clothing or skin, leading to serious injuries. Hot engine surfaces, fluids, and hoses can cause burns, and fuel vapors pose a fire hazard if you’re near the engine while it’s operating. Shutting the engine off (and allowing it to cool if possible) gives you a safe, stable environment to inspect belts, hoses, fluid levels, wiring, and leaks, and to perform maintenance without the risk of moving parts or heat. In short, turning the engine off eliminates the main dangers you’d face during these checks.